How do you find the edges on a 3d shape?

Answer 1

if you can find the vertexes which is just THE POINTS and if you can find how many faces it has you can find out how many edges is on the 3D object this is a short cut add the vertexes and the faces together then subtract that by two

Example: a cube has 5 faces and 5 vertex's add it together which is 10 then subtract 2 and a cube has 8 edges

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The first part is true, the second - the example - as total rubbish.

A cube has 6 faces and 8 vertices. Add together which is 14. Then subtract 2 which gives 12 edges.